CN103968620A - Electronic expansion valve and refrigerating device with same - Google Patents
Electronic expansion valve and refrigerating device with same Download PDFInfo
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- CN103968620A CN103968620A CN201310033140.4A CN201310033140A CN103968620A CN 103968620 A CN103968620 A CN 103968620A CN 201310033140 A CN201310033140 A CN 201310033140A CN 103968620 A CN103968620 A CN 103968620A
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- expansion valve
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- 238000001595 flow curve Methods 0.000 claims abstract description 44
- 238000005057 refrigeration Methods 0.000 claims description 48
- 239000003507 refrigerant Substances 0.000 claims description 37
- RWRIWBAIICGTTQ-UHFFFAOYSA-N anhydrous difluoromethane Natural products FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims 2
- 230000033228 biological regulation Effects 0.000 description 11
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 description 4
- UHCBBWUQDAVSMS-UHFFFAOYSA-N fluoroethane Chemical compound CCF UHCBBWUQDAVSMS-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention provides an electronic expansion valve and a refrigerating device with the same, wherein the electronic expansion valve comprises a valve port and a valve needle, the electronic expansion valve controls the valve needle to move up and down according to received pulse signals so as to change the opening degree of the electronic expansion valve, and the shape and the diameter of the valve needle are set to ensure that the flow curve of the electronic expansion valve has the following characteristics: the flow curve comprises a starting point A, a first turning point B, a second turning point D and an end point E; the starting point A corresponds to the full-closed state of the electronic expansion valve, the corresponding pulse number is zero, and the corresponding flow rate is Q0(ii) a The number of pulses corresponding to the first turning point B is P1Corresponding to a flow rate of Q1(ii) a The number of pulses corresponding to the second turning point D is P2Corresponding to a flow rate of Q2(ii) a The end point E corresponds to the full-open state of the electronic expansion valve and the corresponding pulse number is P3The corresponding flow rate is Q3; wherein, P1≤6%P3；P2≥80%P3；Q0≤Q1；Q1/Q2≤0.25；0.3≤Q2/Q3Less than or equal to 0.7. The electronic expansion valve improves the adjustment precision and enlarges the throttle opening and the adjustment range by changing the pulse value and the flow value corresponding to the flow curve.
Description
Technical Field
The invention relates to the field of refrigerating devices, in particular to an electronic expansion valve and a refrigerating device with the same.
Background
The electronic expansion valve is one of common throttling devices of a household variable-frequency room air conditioner, has good variable-working-condition adjusting characteristic and is easy to control by a program, and the energy consumption of the air conditioner is reduced. The flow characteristic of the electronic expansion valve is generally described by a flow curve, and the flow curve of the electronic expansion valve is a quadratic curve, namely, a left branch part of a parabola which is opened downwards, because a conical valve head which is easy to machine is adopted. The electronic expansion valve in the prior art is mainly suitable for the air conditioning system of the conventional refrigerant such as HCFC22 and HFC 410A. Fig. 1 shows a flow diagram of an electronic expansion valve for a 3.2KW to 5.0KW room air conditioner with a refrigerant of HFC 410A. Wherein, the diameter of the valve port of the electronic expansion valve is 1.65 mm.
The refrigerant HCFC22 which has damage to the ozone layer is being eliminated, and the HFC410A which is used as the transition refrigerant has higher greenhouse effect and is also eliminated. HFC32, HC290, HFOs and their mixture have better environmental protection performance and become the popular candidate substitute in the industry. Compared with HCFC22 and HFC410A, HFC32 has larger refrigerating capacity per unit mass and heating capacity per unit mass, HFC32 has smaller mass circulation flow in a refrigerating device when the capacity of the refrigerating device is the same, and the technical problems of smaller throttle opening of an electronic expansion valve, reduced regulating range and regulating precision are easily caused by smaller required flow area when the same throttling device such as the electronic expansion valve is used, so that the electronic expansion valve in the prior art cannot meet the actual throttling requirement of the HFC32 refrigerating device.
Disclosure of Invention
The invention aims to provide an electronic expansion valve and a refrigerating device with the same, so as to achieve the purposes of improving the adjustment precision of the expansion valve and enlarging the throttle opening and the adjustment range.
In order to achieve the above object, the present invention provides an electronic expansion valve, comprising a valve port and a valve needle engaged with the valve port, wherein the electronic expansion valve controls the valve needle to move up and down according to a received pulse signal to change an opening degree of the electronic expansion valve, and a shape of the valve needle and a diameter of the valve port are set such that a flow curve of the electronic expansion valve has the following characteristics: the flow curve comprises a starting point A, a first turning point B, a second turning point D and an end point E; the starting point A corresponds to the electronic expansion valveClosed state, corresponding pulse number is zero, and corresponding flow rate is Q0(ii) a The number of pulses corresponding to the first turning point B is P1Corresponding flow rate is Q1(ii) a The number of pulses corresponding to the second turning point D is P2Corresponding flow rate is Q2(ii) a The end point E corresponds to the fully opened state of the electronic expansion valve, and the corresponding pulse number is P3Corresponding flow rate is Q3(ii) a Wherein, P1≤6%P3；P2≥80%P3；Q0≤Q1；Q1/Q2≤0.25；0.3≤Q2/Q3≤0.7。
Further, the valve needle comprises a control section for controlling the opening degree of the electronic expansion valve, the control section comprises a first control valve section, a second control valve section and a third control valve section which are sequentially connected along the axis of the valve needle, and the first control valve section, the second control valve section and the third control valve section respectively control flow curves between the starting point A and the first turning point B, between the first turning point B and the second turning point D and between the second turning point D and the end point E.
Further, the first control valve section is a cylindrical section; the second control valve section is a first conical section, the first end of the first conical section is connected with the cylindrical section, the diameters of the first conical section and the cylindrical section are the same, and the diameters of the first conical section are sequentially reduced along the direction far away from the cylindrical section; the third control valve section is a second conical section, the second conical section is connected with the second end of the first conical section and has the same diameter, the diameters of the second conical section are sequentially reduced along the direction far away from the first conical section, and the cone angle of the first conical section is smaller than that of the second conical section.
Further, the first conical section has a first cone angle a, wherein 0 DEG < a ≦ (12 d-0.5 d)2) (ii) the second cone segment has a second cone angle b, (12 d-0.5 d)2) B is less than or equal to 150 degrees, wherein d is the diameter value of a valve port (20) of the electronic expansion valve, the range of d is 0.5-10, and the unit of the diameter is mm.
Further, the flow rate Q corresponding to the first turning point B of the flow curve1Flow rate Q corresponding to second turning point D2Ratio of (A to (B)The value is 0.1 to 0.2.
Further, the flow Q corresponding to the second turning point D of the flow curve2Flow rate Q corresponding to third turning point E3Is 0.35 to 0.65.
Further, the flow rate corresponding to the end point EWherein d is the diameter of the valve port of the electronic expansion valve, d ranges from 0.5 to 10, the diameter is in mm, epsilon is the absolute pressure ratio of the inlet and the outlet of the electronic expansion valve, T is the absolute temperature value of the medium at the inlet of the electronic expansion valve, and the unit of the absolute temperature is K.
The invention provides a refrigerating device which comprises the electronic expansion valve.
Furthermore, when the flow rate is tested according to the regulation of JB/T10212-2011, the flow rate Q corresponding to the second turning point D of the flow rate curve of the electronic expansion valve2The ratio of the rated refrigerating capacity C of the refrigerating device to the rated refrigerating capacity C of the refrigerating device is 2.5L/min KW to 3.0L/min KW.
Further, the refrigerant of the refrigeration device is HFC32, a mixture of HFC32 and HFO1234yf having a mass ratio of 70% or more, or a mixture of HFC32 and HFO1234ze having a mass ratio of 70% or more, and the rated refrigeration capacity C of the refrigeration device is 2.0KW to 16 KW.
Further, the refrigerant of the refrigeration apparatus is HFC161, and the rated refrigerating capacity C of the refrigeration apparatus is 2.0KW to 12.5 KW.
Furthermore, when the JB/T10212-2011 specifies the test flow, the flow Q corresponding to the second turning point D of the flow curve of the electronic expansion valve2The ratio of the rated refrigerating capacity C of the refrigerating device to the rated refrigerating capacity C of the refrigerating device is 3.5L/min KW to 4.2L/min KW.
Further, the refrigerant of the refrigeration apparatus is HC290, and the rated refrigerating capacity C of the refrigeration apparatus is 1.5KW to 5.0 KW.
Further, the refrigerant of the refrigerating device is HCFC22, and the rated refrigerating capacity C of the refrigerating device is 2.0KW to 16 KW.
Furthermore, when the flow rate is tested according to the regulation of JB/T10212-2011, the flow rate Q corresponding to the second turning point D of the flow rate curve of the electronic expansion valve2The ratio of the rated refrigerating capacity C of the refrigerating device to the rated refrigerating capacity C of the refrigerating device is 3.0L/min KW to 3.7L/min KW.
Further, the refrigerant of the refrigeration apparatus is HFC410A, and the rated refrigerating capacity C of the refrigeration apparatus is 2.0KW to 16KW in size.
Further, the refrigerant of the refrigeration apparatus is HC1270, and the rated refrigerating capacity C of the refrigeration apparatus is 1.5KW to 5.0 KW.
By applying the electronic expansion valve, the flow curve slope between the first turning point B and the second turning point D is reduced, the flow value corresponding to the second turning point D is reduced, and the pulse difference between the first turning point B and the second turning point D is increased, so that the purposes of improving the regulation precision of the electronic expansion valve and increasing the throttle opening and the regulation range are achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a graph of a flow rate profile for an electronic expansion valve of the prior art;
FIG. 2 is a schematic diagram of an electronic expansion valve according to an embodiment of the present invention;
FIG. 3 is a bottom view of FIG. 2;
FIG. 4 is a flow chart of an electronic expansion valve according to a first embodiment of the present invention;
FIG. 5 is a flow chart of an electronic expansion valve according to a second embodiment of the present invention;
FIG. 6 is a flow chart of an electronic expansion valve according to a third embodiment of the present invention;
FIG. 7 is a graph illustrating the flow rate through an electronic expansion valve according to a fourth embodiment of the present invention;
FIG. 8 is a flow chart of an electronic expansion valve according to a fifth embodiment of the present invention;
FIG. 9 is a flow chart of an electronic expansion valve according to a sixth embodiment of the present invention;
fig. 10 is a flow rate diagram of an electronic expansion valve according to a seventh embodiment of the present invention;
fig. 11 is a schematic view of the diameter of a valve needle of an electronic expansion valve according to a second embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention provides an electronic expansion valve, which comprises a valve port and a valve needle matched with the valve port, wherein the valve port is an upper end opening of a valve core through hole. The electronic expansion valve controls the valve needle to move up and down according to the received pulse signal so as to change the fit clearance between the valve needle and the valve port and further change the opening degree of the electronic expansion valve. The shape of the valve needle and the diameter of the valve port are set to ensure that the flow curve of the electronic expansion valve has the following characteristics: the flow curve includes a starting point a, a first inflection point B, a second inflection point D, and an ending point E. The starting point A corresponds to the fully closed state of the electronic expansion valve, the pulse number corresponding to the starting point A is zero, and the corresponding flow rate is Q0. The number of pulses corresponding to the first turning point B is P1Corresponding flow rate is Q1. The number of pulses corresponding to the second turning point D is P2Corresponding flow rateIs Q2. The end point E corresponds to the fully open state of the electronic expansion valve. The number of pulses corresponding to the end point E is P3Corresponding flow rate is Q3. Wherein, P1≤6%P3；P2≥80%P3；Q0≤Q1；Q1/Q2≤0.25；0.3≤Q2/Q3≤0.7。
By applying the electronic expansion valve, the flow curve slope between the first turning point B and the second turning point D is reduced, the flow value corresponding to the second turning point D is reduced, and the pulse difference between the first turning point B and the second turning point D is increased, so that the purposes of improving the regulation precision of the electronic expansion valve and increasing the throttle opening and the regulation range are achieved.
The valve needle comprises a control section for controlling the opening degree of the electronic expansion valve, wherein the control section comprises a first control valve section, a second control valve section and a third control valve section which are sequentially connected along the axis of the valve needle, and the first control valve section, the second control valve section and the third control valve section respectively control flow curves between a starting point A and a first turning point B, between the first turning point B and a second turning point D and between the second turning point D and an end point E.
Specifically, as shown in fig. 2 and 3, in the present embodiment, the first control valve section of the valve needle 10 is a cylindrical section. The second control valve section is a first conical section, the first end of the first conical section is connected with the cylindrical section, the diameters of the first conical section and the cylindrical section are the same, and the diameters of the first conical section are sequentially reduced along the direction far away from the cylindrical section. The third control valve section is a second conical section, the second conical section is connected with the second end of the first conical section and has the same diameter, the diameters of the second conical section are sequentially reduced along the direction far away from the first conical section, and the cone angle of the first conical section is smaller than that of the second conical section.
Preferably, the first conical section has a first cone angle a, wherein 0 DEG < a ≦ (12 d-0.5 d)2) Degree. The second conical segment has a second cone angle b, wherein (12 d-0.5 d)2) B is less than or equal to 150 degrees, d is the diameter value and range of the valve port 20 of the electronic expansion valveIs 0.5-10, the diameter is in mm.
Further, in a cross section of the valve needle 10 on the axis, a first position a1 and a second position B1 are provided on the cylindrical section. Wherein the second position B1 is the connection point of the cylindrical section and the first conical section, and the line connecting the first position a1 and the second position B1 is parallel to the axis of the valve needle 10.
The point of attachment of the first conical segment to the second conical segment in the aforementioned cross-section of the valve needle 10 at the axis is the third position D1, wherein the third position D1 is on the same side of the valve needle 10 axis as the second position B1.
The end of the second conical section in the aforesaid cross-section of the valve needle 10 axis is provided with a fourth position E1, wherein the fourth position E1 and the third position D1 are both on the same side of the valve needle 10 axis.
It should be noted that the above embodiments do not limit the present invention, for example, in an embodiment not shown in the drawings, the cross-sectional profile of the second control valve section is a first curve, and the cross-sectional profile of the third control valve section is a second curve. The curve may be, for example, a parabola. And the first curve and the second curve make the electronic expansion valve have the following effects: p1≤6%P3；P2≥80%P3；Q0≤Q1；Q1/Q2≤0.25；0.3≤Q2/Q3< 0.7, the present embodiment is the same as the above embodiment except for the above features.
Flow rate Q corresponding to first turning point B of flow rate curve in the above embodiment1Flow rate Q corresponding to second turning point D2The ratio of (A) to (B) is 0.1 to 0.2. Further, the flow Q corresponding to the second turning point D of the flow curve2Flow rate Q corresponding to third turning point E3Is 0.35 to 0.65.
Flow rate corresponding to end point EWherein d is the diameter of the valve port 20 of the electronic expansion valveIn the range of 0.5-10, the diameter is in mm. Epsilon is the absolute pressure ratio of the inlet and the outlet of the electronic expansion valve. T is the value of the absolute temperature of the medium at the inlet of the electronic expansion valve, in units of K.
The first embodiment of the present invention provides an electronic expansion valve with a valve port 20 having a diameter of 1.0mm, and the flow curve of the electronic expansion valve is shown in fig. 4. Specifically, the pulse number and the flow rate value corresponding to the starting point a, the first turning point B, the second turning point D and the end point E of the flow curve of the electronic expansion valve in the present embodiment are shown in table one.
The second embodiment of the present invention provides an electronic expansion valve with a valve port 20 having a diameter of 1.3mm, and the flow curve of the electronic expansion valve is shown in fig. 5. Specifically, the pulse number and the flow rate value corresponding to the starting point a, the first turning point B, the second turning point D and the end point E of the flow curve of the electronic expansion valve in the present embodiment are shown in table one.
The third embodiment of the present invention provides an electronic expansion valve with a valve port 20 having a diameter of 1.4mm, and the flow curve of the electronic expansion valve is shown in fig. 6. Specifically, the pulse number and the flow rate value corresponding to the starting point a, the first turning point B, the second turning point D and the end point E of the flow curve of the electronic expansion valve in the present embodiment are shown in table one.
The fourth embodiment of the present invention provides an electronic expansion valve with a valve port 20 having a diameter of 1.65mm, and the flow curve of the electronic expansion valve is shown in fig. 7. Specifically, the pulse number and the flow rate value corresponding to the starting point a, the first turning point B, the second turning point D and the end point E of the flow curve of the electronic expansion valve in the present embodiment are shown in table one.
The fifth embodiment of the present invention provides an electronic expansion valve with a valve port 20 having a diameter of 1.8mm, and the flow curve of the electronic expansion valve is shown in fig. 8. Specifically, the pulse number and the flow rate value corresponding to the starting point a, the first turning point B, the second turning point D and the end point E of the flow curve of the electronic expansion valve in the present embodiment are shown in table one.
The sixth embodiment of the present invention provides an electronic expansion valve with a valve port 20 having a diameter of 2.4mm, and the flow curve of the electronic expansion valve is shown in fig. 9. Specifically, the pulse number and the flow rate value corresponding to the starting point a, the first turning point B, the second turning point D and the end point E of the flow curve of the electronic expansion valve in the present embodiment are shown in table one.
The seventh embodiment of the present invention provides an electronic expansion valve with a valve port 20 having a diameter of 2.5mm, and the flow curve of the electronic expansion valve is shown in fig. 10. Specifically, the pulse number and the flow rate value corresponding to the starting point a, the first turning point B, the second turning point D and the end point E of the flow curve of the electronic expansion valve in the present embodiment are shown in table one.
TABLE-electronic expansion valve various embodiments characteristic pulse number and characteristic air flow rate look-up table
The specific implementation method of the flow curve in the embodiment of the present invention is further explained by the detailed description of the second embodiment. The flow rate profile of the second embodiment of the present invention is shown in fig. 5, in which the starting point a, the first inflection point B, the second inflection point D and the ending point E of the curve correspond to the first position a1, the second position B1, the third position D1 and the fourth position E1 of the needle 10 of fig. 2, respectively. When the valve port 20 is located between the first position a1 and the second position B1, the valve needle 10 is located in the cylindrical section, the diameter of the cylindrical section is smaller than that of the valve port 20, and the annular gap formed by the valve needle 10 and the valve port 20 does not change along with the up-and-down movement of the valve needle 10, so that the flow rate is not changed corresponding to the section AB in fig. 5. When the valve port 20 is located between the second position B1 and the third position D1, the valve needle 10 is located in the first conical section, and the taper angle of the first conical section is between 0 to 12D to 0.5D2The annular gap formed by the valve needle 10 and the valve port 20 increases slowly with the upward movement of the valve needle 10, so that the flow rate corresponding to segment BD in fig. 5 increases slowly with the number of pulses. When the valve port 20 is between the third position D1 and the fourth position E1, the valve needle 10 is in the second conical section and the conical angle of the second conical section is betweenAt 12d-0.5d2150 deg., the annular gap formed by the valve needle 10 and the valve port 20 increases rapidly with the upward movement of the valve needle 10, and thus the flow rate increases rapidly with the number of pulses corresponding to section DE in fig. 5. The desired flow curve can be obtained by designing the diameter of the valve needle 10 and matching the diameter of the valve port 20.
It should be noted that the diameter view of the valve needle 10 associated with the valve port 20 in the second embodiment is shown in fig. 11, wherein the curved lines a2, B2, D2, E2 correspond to the first position a1, the second position B1, the third position D1 and the fourth position E1, respectively, of the valve needle 10 in fig. 2. As can be seen, the diameter of the valve needle decreases with increasing pulse number, i.e. when the curve is in the section A2B2, the cylindrical section of the valve needle 10 is disposed in cooperation with the valve port 20. When the curve is in section B2D2, the first conical section of the valve needle 10 is disposed in cooperation with the valve port 20. When the curve is in the segment D2E2, the second conical segment of the valve needle 10 is disposed in cooperation with the valve port 20.
The invention also provides a refrigerating device which comprises the electronic expansion valve.
When the refrigerating device tests the flow according to the regulation of JB/T10212-2011, the flow Q corresponding to the second turning point D of the flow curve of the electronic expansion valve2The ratio k to the rated refrigerating capacity C of the refrigerating apparatus may be 2.5L/(min · KW) to 3.0L/(min · KW).
When the ratio k is 2.5L/(min · KW) to 3.0L/(min · KW), the refrigerant of the refrigeration apparatus is HFC-32, a mixture of HFC32 and HFO1234yf in a mass ratio of 70% or more, or a mixture of HFC-32 and HFO1234ze in a mass ratio of 70% or more, and the rated refrigeration capacity C of the refrigeration apparatus is 2.0KW to 16 KW.
Specifically, the eighth embodiment of the present invention provides a refrigeration device whose refrigerant is HFC 32. The rated refrigerating capacity C of the refrigerating device is 2.0KW to 2.6 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.0mm in the first embodiment.
The ninth embodiment of the present invention provides a refrigeration device whose refrigerant is HFC 32. The rated refrigerating capacity C of the refrigerating device is 2.6KW to 3.6 KW. The refrigerating device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.3mm in the second embodiment.
The tenth embodiment of the invention provides a refrigerating device with HFC32 as refrigerant. The rated refrigerating capacity C of the refrigerating device is 5.0KW to 7.2 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.65mm in the fourth embodiment.
The eleventh embodiment of the present invention provides a refrigeration device whose refrigerant is HFC 32. The rated refrigerating capacity C of the refrigerating device is 10KW to 15 KW. The refrigeration device adopts an electronic expansion valve with the diameter d of the valve port 20 of the sixth embodiment being 2.4 mm.
When the ratio k is 2.5L/(min · KW) to 3.0L/(min · KW), the rated refrigerating capacity C of the refrigerating apparatus is 2.0KW to 12.5KW when the refrigerant of the refrigerating apparatus is HFC 161.
Specifically, the twelfth embodiment of the present invention provides a refrigeration device in which the refrigerant is HFC 161. The rated refrigerating capacity C of the refrigerating device is 2.0KW to 2.6 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.0mm in the first embodiment.
A thirteenth embodiment of the present invention provides a refrigeration apparatus having a refrigerant of HFC 161. The rated refrigerating capacity C of the refrigerating device is 2.6KW to 3.6 KW. The refrigerating device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.3mm in the second embodiment.
A fourteenth embodiment of the present invention provides a refrigeration apparatus having a refrigerant of HFC 161. The rated refrigerating capacity C of the refrigerating device is 5.0KW to 7.2 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.65mm in the fourth embodiment.
Furthermore, when the refrigerating device tests the flow according to the regulation of JB/T10212-2011, the flow Q corresponding to the second turning point D of the flow curve of the electronic expansion valve2The ratio k to the rated refrigerating capacity C of the refrigerating device can also be 3.5L/(C)min · KW) to 4.2L/(min · KW).
When the ratio k is 3.5L/(min · KW) to 4.2L/(min · KW), the rated refrigerating capacity C of the refrigerating apparatus is 1.5KW to 5.0KW when the refrigerant of the refrigerating apparatus is HC 290.
Specifically, a fifteenth embodiment of the invention provides a refrigeration apparatus in which the refrigerant is HC 290. The rated refrigerating capacity C of the refrigerating device is 2.6KW to 3.6 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.4mm in the third embodiment.
When the ratio k is 3.5L/(min KW) to 4.2L/(min KW), the rated refrigerating capacity C of the refrigerating apparatus is 2.0KW to 16KW when the refrigerant of the refrigerating apparatus is HCFC 22.
A sixteenth embodiment of the present invention provides a refrigeration apparatus wherein the refrigerant is HCFC 22. The rated refrigerating capacity C of the refrigerating device is 2.6KW to 3.6 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.4mm in the third embodiment.
A seventeenth embodiment of the present invention provides a refrigeration apparatus wherein the refrigerant is HCFC 22. The rated refrigerating capacity C of the refrigerating device is 5.0KW to 7.2 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.8mm in the fifth embodiment.
An eighteenth embodiment of the present invention provides a refrigeration apparatus wherein the refrigerant is HCFC 22. The rated refrigerating capacity C of the refrigerating device is 10KW to 15 KW. The refrigeration device adopts an electronic expansion valve with the diameter d of the valve port 20 of the seventh embodiment being 2.5 mm.
When the flow rate is tested according to the regulation of JB/T10212-2011, the ratio k of the flow rate Q2 corresponding to the second turning point D of the flow rate curve of the electronic expansion valve to the rated refrigerating capacity C of the refrigerating device can be 3.0L/(min KW) to 3.7L/(min KW).
When the ratio k is 3.0L/(min KW) to 3.7L/(min KW), the rated refrigerating capacity C of the refrigerating apparatus is 2.0KW to 16KW when the refrigerant of the refrigerating apparatus is HFC 410A.
The nineteenth embodiment of the present invention provides a refrigeration device whose refrigerant is HFC 410A. The rated refrigerating capacity C of the refrigerating device is 2.6KW to 3.6 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.4mm in the third embodiment.
A twentieth embodiment of the present invention provides a refrigeration device wherein the refrigerant is HFC 410A. The rated refrigerating capacity C of the refrigerating device is 5.0KW to 7.2 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.8mm in the fifth embodiment.
A twenty-first embodiment of the present invention provides a refrigeration device wherein the refrigerant is HFC 410A. The rated refrigerating capacity C of the refrigerating device is 10KW to 15 KW. The refrigeration device adopts an electronic expansion valve with the diameter d of the valve port 20 of the seventh embodiment being 2.5 mm.
When the ratio k is 3.0L/(min · KW) to 3.7L/(min · KW), the rated refrigerating capacity C of the refrigerating apparatus is 1.5KW to 5.0KW when the refrigerant of the refrigerating apparatus is HC 1270.
A twenty-second embodiment of the present invention provides a refrigeration apparatus in which the refrigerant is HC 1270. The rated refrigerating capacity C of the refrigerating device is 2.6KW to 3.6 KW. The refrigeration device adopts the electronic expansion valve with the diameter d of the valve port 20 of 1.4mm in the third embodiment.
The flow rates in the above examples were all measured according to the provisions of JB/T10212-2011, i.e. under conditions where the inlet is dry air or humid air with a low moisture content of 0.1MPa gauge.
Further, the refrigerating device comprises an inverter air conditioning system.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: by applying the electronic expansion valve, the invention achieves the purposes of improving the regulation precision of the electronic expansion valve and enlarging the throttle opening and the regulation range by changing the pulse values and the flow values corresponding to the starting point, the first turning point, the second turning point and the end point of the flow curve of the electronic expansion valve.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. An electronic expansion valve comprising a valve port (20) and a valve needle (10) engaged with the valve port (20), the electronic expansion valve controlling the up-and-down movement of the valve needle (10) according to a received pulse signal to change the opening degree of the electronic expansion valve, characterized in that the shape of the valve needle (10) and the diameter of the valve port (20) are set such that the flow curve of the electronic expansion valve has the following characteristics:
the flow curve comprises a starting point (A), a first turning point (B), a second turning point (D) and an end point (E);
the starting point (A) corresponds to a fully closed state of the electronic expansion valve, the corresponding pulse number is zero, and the corresponding flow rate is Q0；
The number of pulses corresponding to the first turning point (B) is P1Corresponding flow rate is Q1；
The number of pulses corresponding to the second turning point (D) is P2Corresponding flow rate is Q2；
The end point (E) corresponds to the full-open state of the electronic expansion valve, and the corresponding pulse number is P3Corresponding flow rate is Q3；
Wherein,
P1≤6%P3；
P2≥80%P3；
Q0≤Q1；
Q1/Q2≤0.25；
0.3≤Q2/Q3≤0.7。
2. an electronic expansion valve according to claim 1, wherein the valve needle (10) comprises a control section for controlling the opening degree of the electronic expansion valve, the control section comprising a first control valve section, a second control valve section and a third control valve section arranged in series along the axis of the valve needle (10), the first control valve section, the second control valve section and the third control valve section controlling the flow curves between the starting point (a) and the first turning point (B), between the first turning point (B) and the second turning point (D) and between the second turning point (D) and the end point (E), respectively.
3. The electronic expansion valve of claim 2,
the first control valve section is a cylindrical section;
the second control valve section is a first conical section, the first end of the first conical section is connected with the cylindrical section and has the same diameter, and the diameters of the first conical section are sequentially reduced along the direction far away from the cylindrical section;
the third control valve section is a second conical section, the second conical section is connected with the second end of the first conical section, the diameters of the second conical section and the first conical section are the same, the diameters of the second conical section are sequentially reduced along the direction far away from the first conical section, and the cone angle of the first conical section is smaller than that of the second conical section.
4. The electronic expansion valve of claim 3,
the first conical section has a first cone angle a, wherein a is more than 0 DEG and less than or equal to (12 d-0.5 d)2) (ii) said second cone section has a second cone angle b, (12 d-0.5 d)2) B is less than or equal to 150 degrees, wherein d is the diameter of the valve port (20) of the electronic expansion valve, the range of d is 0.5-10, and the unit of the diameter is mm.
5. An electronic expansion valve according to claim 1, wherein the flow Q corresponds to a first turning point (B) of the flow curve1A flow rate Q corresponding to the second turning point (D)2The ratio of (A) to (B) is 0.1 to 0.2.
6. Electronic expansion valve according to any of claims 1-5, wherein the flow Q corresponds to a second turning point (D) of the flow curve2A flow rate Q corresponding to the third turning point (E)3Is 0.35 to 0.65.
7. An electronic expansion valve according to claim 1, wherein the end point (E) corresponds to a flow rateWherein d is the value of the diameter of a valve port (20) of the electronic expansion valve, d ranges from 0.5 to 10, the unit of the diameter is mm, epsilon is the absolute pressure ratio of an inlet and an outlet of the electronic expansion valve,t is the value of the absolute temperature of the medium at the inlet of the electronic expansion valve, and the unit of the absolute temperature is K.
8. A refrigeration appliance comprising an electronic expansion valve, wherein the electronic expansion valve is an electronic expansion valve according to any one of claims 1 to 7.
9. A cold appliance according to claim 8, wherein the flow Q corresponding to the second turning point (D) of the flow curve of the electronic expansion valve is measured according to the JB/T10212-2011 specification2The ratio of the rated refrigerating capacity C of the refrigerating device to the rated refrigerating capacity C of the refrigerating device is 2.5L/(min KW) to 3.0L/(min KW).
10. The refrigeration apparatus according to claim 9, wherein the refrigerant of the refrigeration apparatus is HFC32 or a mixture of HFC32 and HFO1234yf having a mass ratio of 70% or more or a mixture of HFC32 and HFO1234ze having a mass ratio of 70% or more, and a rated refrigeration capacity C of the refrigeration apparatus is 2.0KW to 16KW in size.
11. A cold appliance according to claim 9, wherein the refrigerant of the cold appliance is HFC161 and the nominal refrigeration capacity C of the cold appliance is in the range of 2.0KW to 12.5 KW.
12. A cold appliance according to claim 8, wherein the flow Q corresponding to the second turning point (D) of the flow curve of the electronic expansion valve is measured according to the JB/T10212-2011 specification2The ratio of the rated refrigerating capacity C of the refrigerating device to the rated refrigerating capacity C of the refrigerating device is 3.5L/(min KW) to 4.2L/(min KW).
13. A cold appliance according to claim 12, wherein the refrigerant of the cold appliance is HC290 and the nominal cooling capacity C of the cold appliance is in the range of 1.5KW to 5.0 KW.
14. A refrigerating device as recited in claim 12 wherein refrigerant of said refrigerating device is HCFC22 and a rated refrigerating capacity C of said refrigerating device is 2.0KW to 16 KW.
15. A cold appliance according to claim 8, wherein the flow Q corresponding to the second turning point (D) of the flow curve of the electronic expansion valve is measured according to the JB/T10212-2011 specification2The ratio of the rated refrigerating capacity C of the refrigerating device to the rated refrigerating capacity C of the refrigerating device is 3.0L/(min KW) to 3.7L/(min KW).
16. A cold appliance according to claim 15, wherein the refrigerant of the cold appliance is HFC410A, and the nominal refrigeration capacity C of the cold appliance is in the range of 2.0KW to 16 KW.
17. A cold appliance according to claim 15, wherein the refrigerant of the cold appliance is HC1270 and the nominal cooling capacity C of the cold appliance is in the range of 1.5KW to 5.0 KW.
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| CN109458464A (en) * | 2018-11-20 | 2019-03-12 | 珠海励高精工制造有限公司 | Electric expansion valve |
| CN111396618A (en) * | 2016-03-28 | 2020-07-10 | 株式会社不二工机 | Electric valve |
| US10941955B2 (en) | 2017-10-27 | 2021-03-09 | Dometic Sweden Ab | Systems, methods, and apparatuses for providing communications between climate control devices in a recreational vehicle |
| CN113483453A (en) * | 2021-07-13 | 2021-10-08 | 珠海格力电器股份有限公司 | Control method and device for air conditioning equipment, electronic equipment and storage medium |
| CN113494619A (en) * | 2016-06-14 | 2021-10-12 | 株式会社鹭宫制作所 | Electric valve |
| US11254183B2 (en) | 2017-08-25 | 2022-02-22 | Dometic Sweden Ab | Recreational vehicle, cooling device, controlling system and method for controlling the cooling device |
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| CN113483453A (en) * | 2021-07-13 | 2021-10-08 | 珠海格力电器股份有限公司 | Control method and device for air conditioning equipment, electronic equipment and storage medium |
| WO2023030409A1 (en) * | 2021-09-02 | 2023-03-09 | 浙江盾安人工环境股份有限公司 | Valve needle and electronic expansion valve having same |
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